128 



GEOLOGY OF TONOPAH MIKING DISTRICT, NEVADA. 



Vein rone 



-H Surface 



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Wimj, 

 iiiim 



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Scale 



a 10 feet 



FIG. 27. Sections showing thestructurc of the Burro Xo. 1 vein: A, Vertical detailed sketched cross section of a portion of 

 Burro No. 1 vein at the surface, as exposed by a prospecting pit, at a point about 600 feet west of the probable junction 

 with the Mizpah vein. B, Vertical detailed sketched cross section of a portion of Burro Xo. 1 vein at the surface, as 

 exposed by surface workings, at a point about 128 feet west of section A. C, Vertical detailed sketched cross sec- 

 tion of Burro No. 1 vein, as exposed at the surface, at a point 6 feet east of section B, showing rapid thinning and 

 disappearance of quartz from the vein zone. D, Detailed sketched vertical section of Burro No. 1 vein at a point about 

 180 feet west of sections B and C, showing hanging-wall and foot-wall veins In the vein zone. E, Vertical detailed 

 sketched cross section of a portion of Burro No. 1 vein, as exposed at the surface by a prospecting pit, at a point about 

 150 feet west of section I), and near the farthest point west that the vein has been traced, showing vein zone with 

 only hanging-wall streak, and also the manner of dying out and disappearance of this class of veins. F. Horizontal 

 sketched plan of Burro No. 1 vein, uniting the two vertical sections B and C, showing the manner in which the 

 change takes place. In all these figures a filtered andcsite; b^q 



